use print instead of printf

backend/filesystem/store.go

@@ -164,7 +164,7 @@ func (s *Store) create() error {
 	if info, err := s.UserAdd("root", store.InitialPassword, true); err != nil {
 		log.Fatalf("error adding initial user: %s", err)
 	} else {
-		log.Printf("initial user added with username \"root\"")
+		log.Print("initial user added with username \"root\"")
 		s.InitialUser = info.Snowflake
 	}